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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/hr °C
kcal/m² hr °C
kcal/m²
kcal/m hr °C

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Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Peclet number
Stanton number
Biot number
Grashoff number

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

66.7°C
60°C
40°C
20°C

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Two dimensional cases only
Three dimensional cases only
One dimensional cases only
Regular surfaces having non-uniform temperature gradients

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)

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Heat and Mass Transfer
Pick up the wrong case. Heat flowing from one side to other depends directly on

Time
Thickness
Temperature difference
Face area

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MORE MCQ ON Heat and Mass Transfer

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